Answer: catalyst

AnswerCrossword Clue
CATALYSTStimulus of a kind
catalystanything precipitating an event
catalysta substance that speeds a chemical reaction
catalystsubstance causing a chemical reaction without itself being affected
CATALYSTChange agent
CATALYSTChemical reaction helper
CATALYSTWhat sets things in motion
CATALYSTIt makes things happen
CATALYSTPrompter
CATALYSTInstigator
CATALYSTPart of a chemical reaction
CATALYSTReaction facilitator
CATALYSTSpark plug of a sort
CATALYSTAgent for action
CATALYSTThat which causes
CATALYSTChemist's reaction-producer
CATALYSTPrecipitating agent
CATALYSTSpark
CATALYSTAgent of change
CATALYSTChemist's facilitator
CATALYSTIt'll get you a reaction?